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Journal of Materials Science: Materials in Electronics

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01-04-2024

Soft magnetic properties, microstructure, and growth mechanism of FeSiAl soft magnetic powder cores fabricated via hexafluozirconic acid passivation

Authors: Junyao Zhang, Hao Lu, Yaqiang Dong, Xingjie Jia, Yanqiu Li, Liping Yang, Lingwen Cai, Lidong Liu, Aina He, Jiawei Li, Xincai Liu

Published in: Journal of Materials Science: Materials in Electronics | Issue 11/2024

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Abstract

In order to develop FeSiAl soft magnetic powder cores (SMPCs) with excellent soft magnetic properties, FeSiAl powder passivated by hexafluorozirconic acid (H₂ZrF₆) was sucessfully prepared and the effect of different concentrations of H₂ZrF₆ on the effective permeability (μ_e) and core loss (P_cv) of FeSiAl SMPCs were systematically studied. H₂ZrF₆ (0.1 wt% of FeSiAl powder) passivation successfully optimized the soft magnetic properties, when the μ_e reached 94, the P_cv was only 180 mW/cm³ at 0.05 T and 100 kHz. SEM, XRD, FTIR, XPS, and TEM were used to investigate the microstructure and growth mechanism of the coating layer. The FeSiAl powder was passivated by H₂ZrF₆ to form a composite coating layer with dominating Fe₂O₃, Al₂O₃, SiO₂, ZrF₄ and a small amount of AlF₃, ZrO₂, while the AlF₃ and ZrO₂ content increased significantly after annealing. In addition, this study effectively improved the high frequency characteristics of FeSiAl SMPCs and analyzed the generation of coating layer, providing a feasible way for the insulation treatment of soft magnetic powder cores.

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Title: Soft magnetic properties, microstructure, and growth mechanism of FeSiAl soft magnetic powder cores fabricated via hexafluozirconic acid passivation
Authors: Junyao Zhang
Hao Lu
Yaqiang Dong
Xingjie Jia
Yanqiu Li
Liping Yang
Lingwen Cai
Lidong Liu
Aina He
Jiawei Li
Xincai Liu
Publication date: 01-04-2024
Publisher: Springer US
Published in: Journal of Materials Science: Materials in Electronics / Issue 11/2024
Print ISSN: 0957-4522
Electronic ISSN: 1573-482X
DOI: https://doi.org/10.1007/s10854-024-12481-z

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